it's because google plus is a mess.
plus.google.com/communities/116965157741523529510
the other major solo community I know is the solowargame yahoo group, which is ancient.
lone warrior's a good mag if you want something to read, it's $10 for a PDF sub.
the most recent solo book I know of is the one from precis intermedia - it's good, heavily focused on campaigning and armies. don't think there are any other notable recent publications.
two hour wargames games are a look for you, especially for their campaign rules, since they're skirmish games and sort of light rpgs.
scarlet heroes (and the rest of sine nomine's games) have a ton of useful stuff for running a game that might be adaptable to your needs.
um, what else. mythic rpg is pretty commonly used - the mythic gm emulator is a neat way of adding some randomness that works well.
also people go wild for rory's story cubes, they own.
but you're mostly looking at sf skirmishes, so. hm. maybe pick up pulp alley if you can find the pirated pdf to have a look? it has a solo expansion that's not necessary at all, and does well for skirmishes that add a lot of flavour. there's someone on LAF using it for 40kish skirmish games - lead-adventure.de/index.php?topic=95838.0 is one of their threads. They have a really cool style and aren't afraid to stick some 40k dudes down on generic fantasy terrain and have them fight a necromancer.
but assuming you'll actually be using the deadzone rules... which I don't know, I'd suggest putting together some forces and assigning a leader and a person or two each side a (very basic) personality, or a notable trait or something, that you can use to guide their playstyle. scribble down a basic battle plan for the squad before the turn, someone a bit thick might not be good at changing plans mid-game, a greedy git might decide to loot something when the boss would rather they deal with flanking enemy, etc.
basically just play stuff and have fun?